CVE80020 Bridge Design – Assignment 3: Bridge analysis Due Date and Time: 5 PM Wednesday 26 April, submitted in hard copy into the letter box of Dr Hing-Ho Tsang Level 7 ATC Building This assignment is worth 15% of the marks for this subject. The presentation of engineering calculations is an important part of your work – as an engineer other engineers will need to read and understand what you have done. For this assignment:  use A4 lined paper  all writing is to be neat and is to be written on the lines of the paper  all diagrams are to be drawn to scale (where “Spacegass diagrams” are required these are to be taken from Spacegass, but all other diagrams are to be drawn by you)  all lines are to be drawn with a ruler (includes diagrams, graphs, underlining, formulae, arrows, crossing out etc. – absolutely no freehand lines)  You will automatically lose half your assignment mark if you fail to comply with any one of these requirements A bridge is to be built to provide road access to a new distribution warehouse. A single span bridge of 28 m span and 4m width is required. The critical design load for the bridge is the load from a mobile crane that will be used during construction of the warehouse. The bridge is not required to have any edge barriers or any asphalt surfacing – only the beams and the slab, both of which will use 40 MPa concrete (26.5 kN/m3). The bridge will be constructed using 2 identical beams and a 200mm thick slab. The mobile crane is a Liebherr 4 axle 100 tonne capacity. (https://www.liebherr.com/external/products/products-assets/279393/liebherr-187-ltm-1100-4-2-td-187-00-defisr03-2017.pdf) Each axle load (when travelling) is 120 kN (60 kN per wheel). The axle spacings and wheel base are shown below. Using the data provided in Lecture 2, select an appropriate size of open top Super T beam for the bridge. Calculate the appropriate section properties for the composite beams (slab + Super T). Model the structure in Spacegass as a grillage, with 7 transverse members. Submit your design report with the following information: 1. Hand calculations for the section properties of the composite section (the properties of the Super T beam should be taken from the relevant table in AS 5100). 2. Hand calculations to determine the location of the crane on the bridge, and of the crane loads to be applied in the Spacegass model (see next item). 1650mm 2440mm 1650mm 2300mm 3. A loading diagram (drawn by you on a scale plan of the bridge showing all grillage members). This loading diagram should show the actual dimensioned location of every wheel so as to produce the maximum bending moment in a longitudinal beam. It should also show the values and locations of the loads applied to the grillage members to represent these actual wheel loads (assume that the wheel centreline will never be closer than 600mm from the edge of the slab). 4. Separate Spacegass diagrams of (a)wheel loading only (b)self weight loading only (c)total deflection in all members, and (d)total bending moment in the longitudinal beams only. All of these are for the crane position that produces the maximum bending moment in a longitudinal beam. All diagrams are to have the values displayed. 5. The checking that you have undertaken to verify your results. Do not apply any load factors (either for ultimate limit state or for dynamic load allowance). The only loads you need to consider are the static axle loads (4 x 120 kN) and the self weight of the bridge. You do not need to report any results for the transverse slab.